The key to spreading Islam is through mercy and moderation. In the early days, Islam was implemented through mercy, not by force or harshness. A wise person will not push another beyond limits, but instead will encourage him to apply Islam in reasonable portions, based on individual ability and strength of faith. By the same token, that mercy of implementation should also apply to yourself.
If you want to sustain, do not implement Islam with severity. Go easy on yourself, and make your spiritual progress slowly but constantly. Allow yourself to absorb and get accustomed to the new pattern of behaviour in small steps. If you are new to Islam or are rediscovering it after a long period of absence, think of it as learning a new language. If you were to try and cram everything all at once, your mind and your body would not be able to cope. Long term sustainability is the key, and the most sustainable actions are those done in small but consistent steps.
Constantly strive, but don’t push yourself over the limit. The Prophet (SAW) said, “The dearest of actions to Allah is that which is done regularly, even if it is small.”(Al Bukhari and Muslim)
The Qur’an was revealed over the course of 23 years. The sequence of revelation gave space for people to accept and adapt, to understand the nature of Allah, prior to the adherence of rules and regulations. Had the entire Qur’an been revealed to mankind in one go, it would have been a shock to everyone’s systems, and personal implementation of its teachings would have been impossible for the majority.
Therefore, understand that the entire practice of Islam cannot be downloaded into your system overnight. If you try to do this, you are setting yourself to fail. Instead, set realistic aims